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Indmar Marine Engines
External Care
Your engine has been carefully primed and painted to
protect it against rust and corrosion. To keep your engine
looking like new, Indmar recommends applying an anti-
corrosion compound. Regular application (every 3
months) of this Protectant, particularly on exposed metal
surfaces, motor mounts and electrical connections, will
displace water and seal the surfaces against penetration
by corrosive agents. Rinsing the engine with fresh water
between applications of the Protectant will further protect
the exposed surfaces.
INTERNAL (COOLING SYSTEM) CARE
Raw Water Cooling Systems
If your engine is raw water cooled, water from whatever
body of water you are operating in is pumped through
the cooling passages of the engine, exhaust manifolds
and exhaust risers. It is critical that the salt water be
flushed from these cooling passages after use by run-
ning fresh water through the cooling system. For more
convenient flushing, ask your dealer about permanently
installing a flushing device that allows easy connection of
a water hose.
Fresh Water Cooling – Half Systems
A fresh water cooling system that uses anti-freeze in the
engine but raw water in the exhaust manifolds is referred
to as a half-system. Although the engine is protected, it
is still important to flush the engine with fresh water to
remove as much salt water as possible from the raw
water side of the cooling system as well as from the
exhaust manifolds and risers. For more convenient flush-
ing, ask your dealer about permanently installing a flush-
ing device that allows easy connection of a water hose.
Even with diligent flushing, certain cast iron exhaust sys-
tem components called exhaust risers or exhaust elbows
will be significantly affected by salt water. These risers
must be inspected annually and replaced as required. It
is not unusual to have to replace these risers every two
or three years on boats used exclusively in salt water.
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